Mosby Random Test 2

Question 1

How do you calculate the dimensions of a pixel?

Answer 1

by dividing the DFOV by the matrix size

Question 2

how do you calculate the area of a pixel

Answer 2

by squaring the dimension

Question 3

What is used in gas ionization CT detectors?

Answer 3

xenon

Question 4

cupping artifacts most commonly occur in the

Answer 4

brain

Question 5

At its distal end, the spinal cord tapers into the

Answer 5

conus medullaris

Question 6

the primary clinical indication for non-contrast cardiac MDCT is

Answer 6

coronary artery calcium (CAC) quantification for the assessment of atherosclerotic disease

Question 7

What abnormal findings will reduce the density of the liver?

Answer 7

fatty infiltrates

Question 8

During which phase of contrast enhancement optimally demonstrates the relationship between pancreatic neoplasm and the surrounding vasculature?

Answer 8

arterial phase

Question 9

complete cardiac diastole refers to

Answer 9

relaxation of the left & right ventricle
relaxation of L&R atria
t wave of ECG

Question 10

The ability of a CT scanner to accurately image objects with similar densities is termed

Answer 10

contrast resolution or sensitivity Makeup

Question 11

the interaction between x-ray and matter that is responsible for the production of scatter radiation absorbed by the PT and detectors is

Answer 11

Compton

Question 12

normal range for systolic blood pressure in adults

Answer 12

95-140 mm Hg

Question 13

During HRCT of lungs you scan during a full expiration to demonstrate

Answer 13

air trapping due to COPD and emphysema

Question 14

Quantity of radiation dose received by the PT from a series of CT scans is called the

Answer 14

MSAD multiple-scan average dose

Question 15

increase in avg of photon energy of a heterogeneous x-ray beam

Answer 15

beam hardening

Question 16

used with PTs at risk of infection due to immunosuppression or some other form of debilitative disease

Answer 16

strict isolation

was know as protective or reverse isolation

Question 17

the process by which electrons are produced at the cathode of a CT x-ray tube is

Answer 17

thermionic emission

Question 18

the normal platelet count range for an adult is

Answer 18

140,000-440,000/mL of blood

Question 19

The number, length, and organization of the individual detector elements in an MSCT system are referred to as

Answer 19

detector configuration

Question 20

infection may occur indirectly through contact w contaminated objects known as

Answer 20

fomites

Question 21

standard or soft tissue algorithms require

Answer 21

low spatial frequency

Question 22

volume element

Answer 22

voxel

Question 23

the typical range for possible pixel values in a modern ct system is

Answer 23

-1024 to +3071 HU

Question 24

What organs are retroperitoneal

Answer 24

duodenum, pancreas, adrenal glands, kidneys, ureters, bladder

Question 25

the period of peak hepatic parenchymal enhancement following rapid bolus injection of contrast is termed the

Answer 25

portal venous phase

Question 26

normal range for INR

Answer 26

0.8-1.2 | international normalized ration for prothrombin time

Question 27

primary interaction between x-ray photons and tissue during CT

Answer 27

compton

Question 28

CSF is produced in the

Answer 28

choroid plexuses

Question 29

the primary advantage of an isotropic MDCT data-set is

Answer 29

high-quality multiplaner recons

Question 30

the technique that allows the user to select the range of pixel values used in a 3D CT reformat is called

Answer 30

thresholding

Question 31

ring artifacts are typically caused by

Answer 31

faulty detectors

Question 32

Ct images that have been reconstructed from a portion of the data acquisition process in the hopes of reducing PT motion artifact is

Answer 32

segmented images

Question 33

parenteral routes include

Answer 33

IV admin, intramuscular, subcutaneous, intradermal, and intrathecal

Question 34

the purpose of IV contrast is to

Answer 34

increase contrast between adjacent structures and increase beam attenuation of enhanced structures

Question 35

there circle of Willis is composed of

Answer 35

the anterior cerebral, anterior communicated, internal carotid, posterior cerebral, and posterior communicating arteries

Question 36

typical dose of FDG (F-18-fluorodeoxyglucose) for PET-CT

Answer 36

10-15 millicuries

Question 37

the ability of an object to attenuate the x-ray beam is assigned a value known as

Answer 37

linear attenuation coefficient